Process of electric welding.



G. R. MURRAY, L. R. BRINK & W. K. MALMSTROM. PROCESS OF ELECTRIC WELDING.

APPLICATION FILED APR.15, 1912.

1,062,57 1 Patented May 20, 1913.

fig al/5 2 1 1w mm com/um PLANOGRAPII cu., WASHINGTON c.

- tion than the first.

UNITED STATES PATENT OFFICE.

CHARLES R. MURRAY, LEWIS R. BBINK, AND WALTER K. MALMSTROM, OF CHICAGO, ILLINOIS, ASSIGNORS TO BABNHART BROS. & SPINDLER; OF CHICAGO, ILLINOIS, A

CORPORATION OF ILLINOIS.

, PROCESS or ELECTRIC wEiDINc.

T 0 all whom it may concern:

Be it known that we, CHARLES R. Mun RAY, LEWIS R. BRINK, and \VALTER K.-

Our invention relates to an improved. process of electriewelding and has as its principal object the provision of a method; whereby a piece of metal may bewelded to greater cross see;

another piece :having-- a 'As iswell known to those engaged in the art of welding metals, whether by electric or other means, it: has heretofore been con-j sidered impossible to welda given piece .of metal to one having a ,materially larger or The reason for thisv :c'ross-Csection vwould become 'heated to the 30 welding point before the piece. of larger 'crosssectiona Consequently the smaller :piece .would become deformed-under the wpr'essure employed if 'the current were kept .on long enough to raise the larger piece to 36 welding temperature. This difficulty was? all the greater in caseitwas desired to weld;

a thin strip to the faceofa'sheet, in which case the heat the sheet was conducted away over the larger area and dissipated so rapidly that the sheet could not be brought:

to welding temperature before the strip was deformed.

Applicants being desirous of making arti-' cles such as type trays or cases by welding impossible for reasons, above stated. -Applicants then developed the process set out in this application.

In the practice of our new process we are accustomed to weld strips of metal about an eighth of an inch thick on the side of a Specification of Letters Patent.

Patented May 20, 1913.

Application filed April 15, 1912. Serial No. 691,017.

sheet of about the same thickness so that the strip will stand at right anglesto, the sheet. By welding a number of such strips on to the sheet we are able to form a case or tray for holding heavy material such as type, which caseis light inproportion to its strength. It is obvious, however, that the process may be applied to the manufacture of other articles. In order to weld a strip to a sheet in the manner described .we employ a special arrangement of clamps which may be used in a weldingmachine of standard type. Our particular clamping devices are; described and claimed in our copending application filedof even date herewith.

a In practisingour process the metal sheet to be operatedon is held in the machine in a. horizontal position.-;-The"stri to be welded to the sheet isathen fastene between a pair of jaws or-;dies which clamp the strip firmly near its lower-edge and forceithe strip against the uppensurfaceiof the sheet. Im-

mediately below-the clamping dies in which the strip is held we iejmplo'ymn'electrode o'r die which is preferably of a small -upper surface and which' is forced strongly against the lower surfacefof-thesheetaat the point both the sheet and the stripsi'ncethe cur- .rent lines-are prevented from spreading out,

electrode.

but are localized at a pointclose to thelower In the accompanying-drawings:

an 'elevational viewf showing our improved apparatus and the position in which the strip and sheet areheld 'for'welding,;jFig. 2 is 'a sectional elevational viefwtthrough the center of Fig. 1; Fig. 3 is a cross section on the irregular line 3-3 of Fig.2,- looking iii the direction of the arrows; Fig. 4 is a detail cross section on the line H of Fig; 2; and Fig. 5 shows a plan view of a portion of a case or .tray made by our new process.-

Referring more particularly to the drawings 1 represents our clamping die having-a fixed jaw 2, and the movable jaw 3. 3 has aldovetail sliding engagement with the part 1, as illustrated in Figs; 2 and 4. A nut 4 6 is shown in Figs. 1 and 2. The bottom electrode or head 8 also appears in Figs. 1 and 2. This head or electrode is preferably reduced at the top so as to present a small area of contact with the face of the sheet. A lever 9 having a cam surface 9*, is pivoted to the member 5 for forcing the jaws together and a spring 11 is coiled on bolt 5 for separating the jaws. A guiding pin 10 is also provided between the jaws 2 and 3 which prevents part 3 from being forced too close to the jaw 2, and also assists in guiding the jaw 8 in its movement. Both the jaws '2 and 3 are provided with water cooling ducts as shown, and so also is the member 8. Vhen a weld has been made between a strip and sheet in one spot, the pieces being worked on are then moved and the same strip welded to the face of the plate in another spot. In making these welds it is not necessary to form projections of any kind on the face of the plate, or roughen, or indent it in any way. Neither does the strip require to be formed with projections or indentations on the edge to be welded, but both strip and sheet may be used just as they are formed by the ordinary rolling processes of the sheet mills.

As shown in Fig. 5 the completed article consists of a floor or base formed by a sheet- 7 and comprises several compartments formed by a series of strips such as 6.

The article made by the process just described is very stiff and rigid, the strips being held firmly to the plate without other means than the welds produced. The face of the sheet opposite the strips shows small spots of approximately half an inch in diameter more or less, where the sheet has beenraised to melting temperature and in some cases there is a very small indentation in the center of these welded spots due to the pressure of the lower welding head or electrode against the sheet.

It will be understood that the process can be used for making articles other than those herein set forth; also that other types or forms of apparatus can be employed, and the process-carried out in other ways than those herein set forth.

Having thus described our invention, what we claim is:

.1. The process of welding the straight edge of a metal strip to the face of a substantially plane plate which consists in clamping the strip with its straight edge facing the plate, supporting the plate on the Copies of this patent may be obtained for five cents each, by addressing the side opposite said strip, forcing the edge of the strip firmly against the face of the plate, and passing an electric current through the strip and plate.

2. The process of welding an upstanding strip to the face of a plate which consists in engaging the strip on opposite sides substantially at the edge to be welded, engaging the plate substantially opposite the spot to be welded, and passing an electric current between the places of engagement.

3. The process of welding an upstanding strip to the face of a plate which consists in engaging the strip at substantially the edge to be welded, engaging a small area of the plate opposite the spot to be welded, and passing an electric current between the places of engagement. 4

4. The process of welding contacting metal pieces together which consists in passing the electric current between points at op-' posite sides of the same part of one of the pieces to be welded, and a point on the other piece substantially opposite the locus of the weld.

metal pieces together which consists in causing the electric current to pass between substantially the edge portion to be welded-of one piece; and a point on the other piece substantially opposite the locus of-the weld.

6. The process of welding :cont'acting metal pieces together which consists incausing an electric or areas substantially oppositei (one: another at the same-part of the edge to be welded,

and a point "on the other-piece substantially opposite th'locus of the weld.

7. The process of welding :contacting metal articles together which consists .in applying elec rical contact" devices to o pposite sides of the same part ofaii edgexportion of onepiece 'to be weldedfapplying a contact device to a point or area of the'other piece to be welded substantially opposite the locus of the weld, and passing an electric current between said first mentioned c'on t-acts and said last mentioned contact.

In witness whereof, we hereunto subscribe our names this 27th day of March,-A; 1)., 1912.

CHASJR. MURRAY. LEWIS R. BRINK. WVALTER K. MALMSTROM. Witnesses: j

A. L; J ones,

A; S. DENNISON.

Commissioiifer of iatents,

Washington, D. C.

5. The process of welding contacting current to flow between points i I 

